Dye sublimation is what we do.
What software are you printing from?
What are your color management and paper settings?
Finally you must press to see your final color, you cannot compare anything to the unpressed print.
If printing textile use the Epson icc profile for textiles. Dtg has four very good profiles you can download.
Start with proper color management settings and most likely you will be spot on.
Make sure you have selected plain paper. Anything else especially enhanced matte will create a much darker print then you want.
All the things you mention in your post are most likely not the issue.
I spent 20+ min replying with my print settings and somehow lost the post when I tried to add a photo. I will try again.
“What Software are you printing from?”
I mainly use Affinity Photo, but had the same issues with Photoshop.
“What are your color management and paper settings?”
Computer Mac Studio 64GB ram, 2TB hard drive, CPU 10-Core, GPU 32-Core
Printer: Epson SC-F570
Print Settings for Affinity Photo
Presets: Default
Copies: 1
(downward printing arrow): Same as Paper Size
Output Size: US Letter
Paper Source: Roll Paper
Roll Paper Width 17 inch (432 mm)
Media Type: Use Printer Settings (DS Transfer General Purpose/Rigid
Select Target: Off (No Color Adjustment)
Color: Color
Color Mode: Off (No Color Management)
Level: Quality (Sometimes Max Quality)
√ High Speed
Finest Quality: Unchecked (Sometimes Checked)
Layout:
No border
Two-Sided: Off
Reverse page orientation: OFF
Flip Horizontal On and off depending on if printing for under glass products or on top of substrate.
Color Matching:
ColorSync: I tried the Epson icc, and the calibrated one I made. (I have also tried Epson Color Controls)
Advance: Auto Rotate: ON, Print Page Line and Save Paper Roll: OFF (Save paper sometimes ON)
I even tried making a PDF preview and printing that and while not perfect it was a lot closer to the screen look but a tad darker.
I mostly want to make these Pet Memorials.
And a side note having to do all those match questions to post is nerve racking lol.